<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>

        <el-card>
           <el-row>
                <el-col> <el-button type="primary" @click="showAddCateDialog">添加分类</el-button></el-col>
           </el-row>

        <tree-table
            :data="catelist"
            :columns="columns"
            :selection-type="false"
            :expand-type="false"
            :show-index="true"
            index-text="#"
            border
            :show-row-hover="false"
        >
            <!--是否有效-->
            <template slot="isok" slot-scope="scope">
                <i style="color:lightgreen" class="el-icon-success" v-if="scope.row.cat_deleted === false"></i>
                <i style="color:red" class="el-icon-error" v-else></i>
            </template>

            <!--序列等级-->
            <template slot="order" slot-scope="scope">
                <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
                <el-tag size="mini" type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
                <el-tag size="mini" type="warning" v-else="scope.row.cat_level===3">三级</el-tag>
            </template>

            <!--操作-->
            <template slot="opt" slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
            </template>

        </tree-table>

        <!--分页-->
        <el-pagination
            @size-change="handleSizeChange"
            @current-change="handleCurrentChange"
            :current-page="queryInfo.pagenum"
            :page-sizes="[3, 5, 10, 15]"
            :page-size="queryInfo.pagesize"
            layout="total, sizes, prev, pager, next, jumper"
            :total="total">
        </el-pagination>
        </el-card>

        <!--添加分类的对话框-->
        <el-dialog
            title="添加分类"
            :visible.sync="addCateDialogVisble"
            width="50%"
            @close="addCateDialogClosed"
        >

            <el-form :model="addCateForm" :rules="addCateRules" ref="addCateFormRef" label-width="100px">
                <el-form-item label="分类名称:" prop="cat_name">
                    <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>

                <el-form-item label="父级分类:">
                     <el-cascader
                        clearable
                        :options="parentCateList"
                        :props="cascaderProps"
                        v-model="selectedKeys"
                        @change="parentCateChange">
                    </el-cascader>
                </el-form-item>

            </el-form>


            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisble = false">取 消</el-button>
                <el-button type="primary" @click="addCate">确 定</el-button>
            </span>
        </el-dialog>


    </div>
</template>

<script>
export default {
name:'Categories',
created(){
    this.getCateList()
},
data() {
    return {
        //查询条件
        queryInfo:{
            //查询所有的分类
            type:3,
            //当前的页码数
            pagenum:1,
            //每页最多显示多少条数据
            pagesize:5

        },
        //商品分类的数据列表，默认为空
        catelist:[],
        //总数据条数
        total:0,
        //为table指定列属性
        columns:[
            {
                label:'分类名称',
                prop:'cat_name'
            },
            {
                label:'是否有效',
                //把当前列变成模板列
                type:'template',
                template:'isok'
            },
            {
                label:'排序',
                type:'template',
                template:'order'
            },
            {
                label:'操作',
                type:'template',
                template:'opt'
            }
        ],
        addCateDialogVisble:false,
        //添加表单分类的数组对象
        addCateForm:{
            //分类名称
            cat_name:'',
            //父级分类的id
            cat_pid:0,
            //当前分类的等级 默认为一
            cat_level:0
        },
        addCateRules:{
            cat_name:[{required:true,message:'请输入消息名称', trigger:'blur'}]
        },
        //父级分类的列表
        parentCateList:[],
        //用来指定级联选择器配置对象
        cascaderProps: {
            expandTrigger:'hover',
            value: 'cat_id',
            label: 'cat_name',
            children: 'children',
        },
        //选中的父级分类id数组
        selectedKeys:[],
    }
},
methods:{
    async getCateList(){
        const {data:res} = await this.$http.get('categories',{params:this.queryInfo})
        if(res.meta.status !== 200) return this.$message.error('获取商品权限列表失败')
        this.catelist = res.data.result
        this.total = res.data.total
    },
    //监听pagesize改变事件
    handleSizeChange(newSize){
        this.queryInfo.pagesize = newSize
        this.getCateList()
    },
    //监听 当前页码值改变事件
    handleCurrentChange(newPage){
        this.queryInfo.pagenum = newPage
        this.getCateList()
    },
    showAddCateDialog(){
        this.getParentList()
        this.addCateDialogVisble = true

    },
    //获取父级分类的数据列表
    async getParentList(){
        const {data:res} = await this.$http.get('categories',{params:{type:2}})
        if(res.meta.status !== 200) return this.$message.error('获取父级分类列表失败')
        this.parentCateList = res.data
    },
    //级联选择器选项改变时
    parentCateChange(){
        console.log(this.selectedKeys);
        if (this.selectedKeys.length > 0 ) {
            //选中父级里的分类
            this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length -1]
            this.addCateForm.cat_level = this.selectedKeys.length
        } else {
            this.addCateForm.cat_pid = 0
            this.addCateForm.cat_level = 0
        }

    },
    addCate(){
        this.$refs.addCateFormRef.validate(async valid => {
            if(!valid) return
            const {data:res} = await this.$http.post('categories',this.addCateForm)
            console.log(res);
            if(res.meta.status!==201) return this.$message.error('添加分类失败')
            this.$message.success('添加分类成功')
        })
        this.getCateList()
        this.addCateDialogVisble = false
    },
    addCateDialogClosed(){
        this.$refs.addCateFormRef.resetFields()
        this.selectedKeys = []
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
    }
}
}
</script>

<style lang='less' scoped>
.el-cascader {
  width: 100%;
}
</style>